Uroplatus phantasticus not laying eggs

I have 2 females (1 my own CB early 2018 und 1 WC). Both are adult they pair with males - about 4-5weeks later they go down on the griund and pretend to lay eggs.. But they don't lay any.
Both have huge calc sacs. I don't know where they come from, because i don't dust with ca since i noticed them growing (about 5 month ago).
They both get UV (ZooMed 5.0).

I heard that obese Uroplatus don't breed, could that be the problem? Or do you guys have another answer to this problem?

Hey, sry.
1 Female is CB 4/2018 and 1 is WC - both are adult, mated several times with different males (proven breeders).
They have leaf-litter on the ground with different stages of wet and dry substrate - 1 other female is laying regularely (WC), she gets the same food / minerals.